Robotic arm



FIG. 1 is a perspective view of the robotic arm;

FIG. 2 is a top view thereof;

FIG. 3 is a right-side view thereof, the left-side view being substantially identical;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof; and,

FIG. 6 is a perspective view thereof with the robotic arm in a retracted position.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a robotic arm, as shown. 